With what acceleration is it necessary to lift a body with a mass of 0.5 kg to a height of 4 m in order to do 25J work?

Initial data: m (mass of the lifted body) = 0.5 kg; h (the height to which you want to lift the body) = 4 m; A (work to be done when lifting) = 25 J.

Reference data: g (acceleration due to gravity) ≈ 10 m / s2.

The acceleration with which it is required to lift the body is determined from the formula: A = F * S = P * h = m * (g + a) * h, whence g + a = A / (m * h) and a = A / ( m * h) – g.

Calculation: a = 25 / (0.5 * 4) – 10 = 2.5 m / s2.

Answer: The body must be lifted with an acceleration of 2.5 m / s2.